56404520 has 64 divisors (see below), whose sum is σ = 131423040. Its totient is φ = 21772800.

The previous prime is 56404501. The next prime is 56404541. The reversal of 56404520 is 2540465.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 56404520.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 267215 + ... + 267425.

It is an arithmetic number, because the mean of its divisors is an integer number (2053485).

Almost surely, 2^56404520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 56404520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65711520).

56404520 is an abundant number, since it is smaller than the sum of its proper divisors (75018520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

56404520 is a wasteful number, since it uses less digits than its factorization.

56404520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426 (or 422 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 56404520 is about 7510.2942685357. The cubic root of 56404520 is about 383.5052402666.

Adding to 56404520 its reverse (2540465), we get a palindrome (58944985).

The spelling of 56404520 in words is "fifty-six million, four hundred four thousand, five hundred twenty".